two air carts of mass m1=0.87kg and m2=0.48kg are placed on a frictionless track.cart 1 is at rest initally, and a spring bumper with a force constant of 690N/m. cart 2 has a flat metal surface for a bumper, and move toward the bumper of the stationary cart with an intial speed v=0.69m/s. Assume that positive x-axis is directed toward the direction of motion of cart 2.
a)what is the speed of the two cart at the moment when their speeds are equal?
b) how much energy is stored in the spring bumper?